elek opened a new pull request #604: HDDS-1259. OzoneFS classpath separation is broken by the token validation URL: https://github.com/apache/hadoop/pull/604 hadoop-ozone-filesystem-lib-legacy-0.4.0-SNAPSHOT.jar can't work any more together with older hadoop version, after the change of HDDS-1183. {code} 2019-03-13 13:48:51 WARN FileSystem:3170 - Cannot load filesystem: java.util.ServiceConfigurationError: org.apache.hadoop.fs.FileSystem: Provider org.apache.hadoop.fs.ozone.OzoneFileSystem could not be instantiated 2019-03-13 13:48:51 WARN FileSystem:3174 - java.lang.NoClassDefFoundError: org/apache/hadoop/hdds/conf/OzoneConfiguration 2019-03-13 13:48:51 WARN FileSystem:3174 - java.lang.ClassNotFoundException: org.apache.hadoop.hdds.conf.OzoneConfiguration Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hdds/conf/OzoneConfiguration at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:2332) at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2297) at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2393) at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:3208) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:3240) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:121) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:3291) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3259) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:470) at org.apache.hadoop.fs.Path.getFileSystem(Path.java:356) at org.apache.hadoop.fs.shell.PathData.expandAsGlob(PathData.java:325) at org.apache.hadoop.fs.shell.Command.expandArgument(Command.java:245) at org.apache.hadoop.fs.shell.Command.expandArguments(Command.java:228) at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:103) at org.apache.hadoop.fs.shell.Command.run(Command.java:175) at org.apache.hadoop.fs.FsShell.run(FsShell.java:315) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90) at org.apache.hadoop.fs.FsShell.main(FsShell.java:378) Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hdds.conf.OzoneConfiguration at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 21 more {code} And Ozone file system current jar is compatible only with hadoop 3.2 after the latest HA change. It means that ozonefs is broken everywhere where the hadoop version is older than 3.2. See: https://issues.apache.org/jira/browse/HDDS-1259
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